The problem is that i cannot reach the green precious stone in king salomons mines! In some solutions there is an explanation of a hole caused by the russians but i haven't found it. There is no hole!!!! How can i reach the door in the upper right corner where the green key is behind!! Please help me, i don't hope that's a bug of the game. It woud be really nice if someone could explain step by step how to get the green key!!!

Ride back to the switch house and toggle switch #3. Now take another round. This time you will be attacked by a bazooka as soon as you return to the place from where you intend to reach the green gem. The commies will fire a hole into the trails but you will survive. Now return there, clear the area and get the green gem.